noun🔗ShareOpaleA mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O."The geologist carefully examined the opal, noting its beautiful colours but also its softer texture compared to the quartz crystals. "Le géologue a examiné attentivement l'opale, notant ses belles couleurs mais aussi sa texture plus douce par rapport aux cristaux de quartz.mineralgeologymaterialsubstanceChat with AIVocabulary GamePractice Reading
noun🔗ShareCodon stop opalA colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA.""In her molecular biology class, Sarah learned that "opal" is another name for the UGA stop codon, which signals the end of protein synthesis. "Dans son cours de biologie moléculaire, Sarah a appris que « opal » est un autre nom pour le codon stop UGA, qui signale la fin de la synthèse des protéines.biologybiochemistryChat with AIVocabulary GamePractice Reading
noun🔗SharePapillon opaleAny of various lycaenid butterflies of the genus Nesolycaena."While hiking in the rainforest, the butterfly enthusiast excitedly pointed out an opal flitting among the ferns. "En randonnée dans la forêt tropicale, l'amateur de papillons a montré avec enthousiasme un papillon opale voltigeant parmi les fougères.animalinsectbiologynatureChat with AIVocabulary GamePractice Reading